upd78f0114hgb-8es-a Renesas Electronics Corporation., upd78f0114hgb-8es-a Datasheet - Page 115
upd78f0114hgb-8es-a
Manufacturer Part Number
upd78f0114hgb-8es-a
Description
8-bit Single-chip Microcontrollers
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD78F0114HGB-8ES-A.pdf
(505 pages)
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Notes 1.
2.
3.
4.
CPU clock: f
f
f
XP
R
Before shifting from status 2 to status 3 after reset and STOP are released, check the high-speed
system clock oscillation stabilization time status using the oscillation stabilization time counter status
register (OSTC).
Waiting for the oscillation stabilization time is not required when the external RC oscillation clock is
selected as the high-speed system clock by the option byte. Therefore, the CPU clock can be
switched without reading the OSTC value.
When shifting from status 2 to status 1, make sure that MCS is 0.
The watchdog timer operates using internal oscillator even in STOP mode if “internal oscillator cannot
be stopped” is selected by the option byte. Internal oscillation clock division can be selected as the
count source of 8-bit timer H1 (TMH1), so clear the watchdog timer using the TMH1 interrupt request
before watchdog timer overflow. If this processing is not performed, an internal reset signal is
generated at watchdog timer overflow after STOP instruction execution.
All reset sources (RESET input, POC, LVI, clock monitor, and WDT)
: Oscillating
: Oscillating
Status 3
(3) When “internal oscillator cannot be stopped” is selected by option byte
XP
instruction
Interrupt
STOP
MCM0 = 1
Figure 5-15. Status Transition Diagram (3/4)
MCM0 = 0
(when subsystem clock is not used)
Interrupt
HALT
instruction
CHAPTER 5 CLOCK GENERATOR
Note 1
User’s Manual U16961EJ4V0UD
instruction
Interrupt
STOP
f
CPU clock: f
f
XP
R
STOP
: Oscillating
: Oscillating
Status 2
HALT
Note 3
HALT
instruction
Interrupt
R
Interrupt
instruction
MSTOP = 1
MSTOP = 0
STOP
Reset release
HALT instruction
Interrupt
Note 2
f
XP
: Oscillation stopped
CPU clock: f
f
Reset
R
: Oscillating
Status 1
Note 4
R
115
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